import logging
from logging.handlers import RotatingFileHandler

from flask import Flask
from flask import g
from flask import render_template
from flask.ext.wtf.csrf import generate_csrf
from flask_session import Session
from flask_sqlalchemy import SQLAlchemy
from flask_wtf import CSRFProtect
from redis import StrictRedis

from config import config



def setup_log(config_name):
    # 设置日志的记录等级
    logging.basicConfig(level=config[config_name].LOG_LEVEL)  # 调试debug级
    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024 * 1024 * 100, backupCount=10)
    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)static %(filename)static:%(lineno)d %(message)static')
    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)
    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)


db = SQLAlchemy()

redis_store = None

def create_app(config_name):
    setup_log(config_name)
    app = Flask(__name__)
    app.config.from_object(config[config_name])

    db.init_app(app)
    # 给redis内部配置端口号和ip地址
    global redis_store
    redis_store = StrictRedis(host = config[config_name].REDIS_HOST,port = config[config_name].REDIS_PORT,decode_responses=True)
    # 开启当前项目的csrf保护,只做服务器验证
    CSRFProtect(app)
    # 开启app里面的session
    Session(app)

    from info.utils.common import do_index_class
    app.add_template_filter(do_index_class,'index_class')

    # 在返回响应之前执行
    @app.after_request
    def after_request(response):
        csrf_token = generate_csrf()
        response.set_cookie('csrf_token',csrf_token)

        return response

    from info.utils.common import user_login_data
    @app.errorhandler(404)
    @user_login_data
    def page_not_found(e):
        user = g.user
        data = {'user_info':user.to_dict() if user else None}
        return render_template('news/404.html',data = data)

    from info.modules.admin import admin_blu
    app.register_blueprint(admin_blu)


    from info.modules.index import index_blu
    app.register_blueprint(index_blu)

    from info.modules.news import news_blu
    app.register_blueprint(news_blu)

    from info.modules.passport import passport_blu
    app.register_blueprint(passport_blu)

    from info.modules.profile import profile_blu
    app.register_blueprint(profile_blu)

    return app
